A federal appeals court is expected to hear oral arguments Wednesday in the case of a doctor convicted in a 2009 bombing that nearly killed the head of the Arkansas State Medical Board.

Lawyers for Randeep Mann, who was sentenced last year to life in prison, appealed his case to the 8th U.S. Circuit Court of Appeals, arguing that there wasn't sufficient evidence to convict him of charges including using a weapon of mass destruction.

Mann wants the court to dismiss the convictions or at least grant him a new trial.

Prosecutors said Mann, 53, was responsible for a bomb left outside Dr. Trent Pierce's home in West Memphis after the board, headed by Pierce, suspended Mann's license following the overdose death of some of his patients.

Pierce said he believes the attack, which took away his sense of smell and left him blind in one eye and deaf in one ear, was revenge for revoking Mann's license to prescribe narcotics.

Mann, who ran a pain clinic in Russellville, was convicted in 2010 on the weapon of mass destruction count and other charges. Investigators said the explosion outside Pierce's home came from a grenade rigged inside a spare tire.

Prosecutors tried to link Mann to the tire, but his defense attorneys say they didn't succeed.

"A reasonably logical person is left with more questions than answers from the underlying evidence, which resulted in a verdict based on speculation," his lawyers wrote in a court document filed last month. "The proof showed a spare tire was used to booby trap the bomb."

Mann was arrested on weapons charges about a month after the February 2009 bombing. Investigators said they found nearly 100 grenades and a tremendous cache of machine guns and ammunition at or near Mann's home, though almost all of the firearms were legally registered. It took almost a year for agents to build their case against Mann, who was indicted in January 2010.

Oral arguments are slated to be held at the University of Arkansas School of Law in Fayetteville in one of two special sessions this year.

Mann was in custody in at a prison in Coleman, Fla., according to the Federal Bureau of Prisons website.